Transfer Grilles: What Are They?
January 01, 2006
Q. I have a question for Doug Garrett, the author of “Beware the Closed Bedroom Door,” which appears on the Home Energy Web site, in the Do It Yourself section. Could you please explain transfer grilles and where I can purchase them? A. According to the Air Conditioning Contractors of America (ACCA) Manual T:Air Distribution Basics, “Transfer grilles can be used to combine isolated rooms or zones into a single larger return zone which can be served by a single return inlet.” In other words, they are used to connect rooms without return grilles to rooms (or zones) with return grilles so the air can easily flow back to the unit. Often this is a lot easier than running a return duct all the way back to the unit! To see why allowing this to happen is critical, read Home Energy’s past articles on the subject. (Search magazine archives at www.homeenergy.org.) By the way,ACCA mentions that you could undercut the door by 1 inch for each 60 CFM. This would mean roughly a 6-inch ...
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